The KEYMAP variable is specified in the Template:Filename file. It defines what keymap the keyboard is in the virtual consoles. Keytable files are provided by the kbd package.

Keyboard layouts

This is the list of known keymap settings to work for the corresponding keyboard layouts. Usually the "map.gz" extension can be ignored.
Most keymaps can be found in the Template:Filename (layout=qwerty, azerty, dvorak, etc.) directory.

Less common but nonetheless useful keymaps under Arch Linux are found in the Template:Filename (architecture=ppc, mac, etc.) directory.